1 Thes. 4:15-18 (ESV)
For this we declare to you by a word from the Lord, that we who are alive, who are left until the coming of the Lord, will not precede those who have fallen asleep.  For the Lord himself will descend from heaven with a cry of command, with the voice of an archangel, and with the sound of the trumpet of God. And the dead in Christ will rise first.  Then we who are alive, who are left, will be caught up together with them in the clouds to meet the Lord in the air, and so we will always be with the Lord.  Therefore encourage one another with these words.
Classic Pre-millennialist text ripe for distortion, but only if you cut it from all context and lack the reading comprehension of a first grader. This is the “Proof Text” for a rapture. I don’t disagree with a rapture perse. I disagree that it will be secret, that it will happen before the tribulation, and that the world will continue on after word as it does now, just missing the righteous in Christ with an outbreak of lawless anarchy. I don’t know where they get that based on this. I do believe a trumpet will sound and we who are still alive when judgment day hits will be caught up in the air to avoid the utter destruction of earth. That is all this is talking about. The dead will be resurrected first, then all who are alive will also be raptured to him in the clouds. We will face the judgment seat there, and live forever after with the Lord. These are words of encouragement, not fear mongering. These types teaching this abominable doctrine of pre-millennialism ought to be totally ashamed of the fantasy stemming from the Jewish Myths Paul warns Titus about. Stop torturing the people with it! Stop making it out to be the gospel, it isn’t and you will be judged for it. Judged for your lack of an ability to read, yet insisting on teaching things you do not understand.